From 4f251a641dde85ef6743e95bfabb485072661a33 Mon Sep 17 00:00:00 2001 From: Jeff Trawick Date: Tue, 24 Nov 2009 21:22:15 +0000 Subject: [PATCH] remove SSLMutex documentation update the session cache description to indicate that the ssl cache mutex is used to serialize access, and that the mutex can be configured using the Mutex directive git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@883880 13f79535-47bb-0310-9956-ffa450edef68 --- docs/manual/mod/mod_ssl.xml | 86 +++---------------------------------- 1 file changed, 5 insertions(+), 81 deletions(-) diff --git a/docs/manual/mod/mod_ssl.xml b/docs/manual/mod/mod_ssl.xml index 617a894b34..fe2862750e 100644 --- a/docs/manual/mod/mod_ssl.xml +++ b/docs/manual/mod/mod_ssl.xml @@ -209,87 +209,6 @@ SSLPassPhraseDialog exec:/usr/local/apache/sbin/pp-filter - -SSLMutex -Semaphore for internal mutual exclusion of -operations -SSLMutex type -SSLMutex none -server config - - -

-This configures the SSL engine's semaphore (aka. lock) which is used for mutual -exclusion of operations which have to be done in a synchronized way between the -pre-forked Apache server processes. This directive can only be used in the -global server context because it's only useful to have one global mutex. -This directive is designed to closely match the -AcceptMutex directive.

-

-The following Mutex types are available:

-
    -
  • none | no -

    - This is the default where no Mutex is used at all. Use it at your own - risk. But because currently the Mutex is mainly used for synchronizing - write access to the SSL Session Cache you can live without it as long - as you accept a sometimes garbled Session Cache. So it's not recommended - to leave this the default. Instead configure a real Mutex.

    • -
  • posixsem -

    - This is an elegant Mutex variant where a Posix Semaphore is used when possible. - It is only available when the underlying platform - and APR supports it.

    • -
  • sysvsem -

    - This is a somewhat elegant Mutex variant where a SystemV IPC Semaphore is used when - possible. It is possible to "leak" SysV semaphores if processes crash before - the semaphore is removed. It is only available when the underlying platform - and APR supports it.

    • -
  • sem -

    - This directive tells the SSL Module to pick the "best" semaphore implementation - available to it, choosing between Posix and SystemV IPC, in that order. It is only - available when the underlying platform and APR supports at least one of the 2.

    • -
  • pthread -

    - This directive tells the SSL Module to use Posix thread mutexes. It is only available - if the underlying platform and APR supports it.

    • -
  • fcntl:/path/to/mutex -

    - This is a portable Mutex variant where a physical (lock-)file and the fcntl() - function are used as the Mutex. - Always use a local disk filesystem for /path/to/mutex and never a file - residing on a NFS- or AFS-filesystem. It is only available when the underlying platform - and APR supports it. Note: Internally, the Process ID (PID) of the - Apache parent process is automatically appended to - /path/to/mutex to make it unique, so you don't have to worry - about conflicts yourself. Notice that this type of mutex is not available - under the Win32 environment. There you have to use the semaphore - mutex.

    • -
  • flock:/path/to/mutex -

    - This is similar to the fcntl:/path/to/mutex method with the - exception that the flock() function is used to provide file - locking. It is only available when the underlying platform - and APR supports it.

    • -
  • file:/path/to/mutex -

    - This directive tells the SSL Module to pick the "best" file locking implementation - available to it, choosing between fcntl and flock, - in that order. It is only available when the underlying platform and APR supports - at least one of the 2.

    • -
  • default | yes -

    - This directive tells the SSL Module to pick the default locking implementation - as determined by the platform and APR.

    • -
-Example -SSLMutex file:/usr/local/apache/logs/ssl_mutex - - - - SSLRandomSeed Pseudo Random Number Generator (PRNG) seeding @@ -446,10 +365,15 @@ The following four storage types are currently supported:

address.

+ Examples SSLSessionCache dbm:/usr/local/apache/logs/ssl_gcache_data
SSLSessionCache shm:/usr/local/apache/logs/ssl_gcache_data(512000) + +

The ssl-cache mutex is used to serialize access to +the session cache to prevent corruption. This mutex can be configured +using the Mutex directive.

 -- 2.50.0